Migrating X.25 over ACC to X.25 over PSI

ManualsBrandsHP ManualsSoftwareHP-UX 11i v3 ONC and NFS Software

Introduction....................................................................................................................... 2

Definition of terms.............................................................................................................. 2

X.25 Overview.................................................................................................................. 3

X.25/ACC........................................................................................................................ 4

X.25/PSI .......................................................................................................................... 5

Features of X.25/PSI....................................................................................................... 6

Benefits of X.25/PSI........................................................................................................ 7

Limitations...................................................................................................................... 8

Migrating X.25/ACC to X.25/PSI........................................................................................ 8

Hardware migration........................................................................................................ 8

Software migration ....................................................................................................... 10

Configuration Migration................................................................................................ 10

Application Migration ................................................................................................... 13

HA Migration.................................................................................................................. 14

X.25/ACC HA Summary............................................................................................... 14

X.25/PSI HA Summary.................................................................................................. 15

HA Migration Summary................................................................................................. 16

ServiceGuard Package Migration ................................................................................... 17

Conclusion...................................................................................................................... 19

For more Information........................................................................................................ 19

Summary of content (19 pages)

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Migrating X.25 over ACC to X.25 over PSI Introduction....................................................................................................................... 2 Definition of terms .............................................................................................................. 2 X.25 Overview.................................................................................................................. 3 X.25/ACC.................................................................
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Introduction X.25 is the International Telecommunication Union-Telecommunication Standardization Sector (ITUT) protocol standard for WAN communication that defines how connections between user devices and network devices are established and maintained. HP has two implementations of X.25. One is based on Advanced Communications Controller (ACC) adapter along with its associated hardware (known as Multi port interface distribution panel), and other is based on Programmable Serial Interface (PSI) adapter.
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PSPDN Packet Switched Public Data Network NLI Network Layer Interface SAM System Administration Manager WAN Wide Area Network X.25/ACC X.25 over ACC adapter/ hardware X.25/ PSI X.25 over PSI network adapter X.25 Overview The Hewlett-Packard X.25 link product provides the hardware and software components to enable HP 9000 systems and Integrity systems to communicate with other HP and non-HP systems over X.25 packet switching networks. The X.25 link implements the CCITT X.
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X.25/ACC The X.25/ACC software product provides X.25 communication over ACC multi port network adapter in a transparent manner. Following are the three layers of protocol (Layer 1, Layer 2 and Layer 3) that are functional when X.25 is used over ACC adapter.
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Note: For X.25/ACC, the X.25 protocol is executed on the ACC adapter rather than in the host. X.25/PSI The X.25/PSI software enables X.25 communication over X.25 PSI network adapter. The protocol implementation in X.25/PSI compares with ACC as follows: - The ACC Hardware (Layer 1) in X.25/ACC is replaced by the serial WAN interface having PSI adapter in X.25/PSI. - The ACC ZCOM I/F driver (Layer 2) in X.25/ACC is replaced by LAP-B layer in X.25/PSI. - The NLI2ZCOM (Layer 3) in X.
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The table below compares X.25/ACC and X.25/PSI, with Protocol layer perspective: Protocol Layer X.25/ACC X.25/PSI Layer 1 ACC Hardware WAN (X.25 PSI adapter) Layer 2 ACC ZCOM I/F Drivers X.25 LAP - B Layer 3 ACC X.25 PLP (NLI2ZCOM) X.25 Packet Layer Protocol (PLP) Features of X.25/PSI X.
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The X.25/PSI software supports the OLAR of PSI cards that provide the capability for the addition, replacement of PSI cards while a system is running, eliminating the need of a reboot. This OLAR feature also improves the Single system High availability (HA). For more information on the OLAR feature with X.25/PSI, see HP X.25/9000 User’s Guide available at: http://docs.hp.com/en/netcom.html#X.25 • X25mibstat utility The X.
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The X.25 PSI adapters cost less compared to the ACC adapters and its corresponding hardware. Moreover, extensive use of X.25 PSI adapters is expected to lower the cost. • Lower operational cost The administration, management, and maintenance costs involved in implementing X.25/PSI are significantly lower than the cost involved in implementing X.25/ACC. This is because of the elimination of additional hardware required, in addition to the network adapter in the former.
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Cards: The HP-UX ACC multi port adapter (Z7340A, Z7200A Z7400A, Z7350A, Z7330A, and Z7300A) is replaced with a X.25 PSI adapter (Product number J3525A) and it requires a PCI or PCI–X slot on the system. Several J3525A adapters may be required, if the ACC adapter that is being replaced has more than two ports. For more information on PSI WAN adapters, see the WAN Adapters and Related Software Solutions webpage at: http://www.hp.
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Software migration The X.25/PSI software product, HP X.25/9000 (J2793B), is available from the HP-UX application releases. This software product is available on all supported HP-UX 11i versions. For the software migration on HP-UX version11i v1, the X.25/ACC software product (Z7476AA, Z7478AA, Z7480AA, Z7486AA, and J2793B) is replaced by only HP X.25/9000 (J2793B) software product. On HP-UX versions 11i v2 and 11i v3, the X.25/ACC software product (Z7344A, J2793B) is replaced by only HP X.
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Step 5: Configure all the ports to be used for X.25 over PSI adapter using SAM or SMH. This creates the X.25 configuration file and the X.25 device for each X.25 interface on the PSI adapter. For more information on configuring X.25 using SAM or SMH, see HP X.25/9000 User’s guide available at: http://docs.hp.com/en/netcom.html#X.25 Note: - Apart from the X.25 configuration file, there is no separate configuration file required for the X.
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# flowcontrol off thruputclass off fast_select_accept disabled reverse_charge disabled def_inpacketsize 128 def_outpacketsize 128 def_inwindow 2 def_outwindow 2 def_inthruputclass 11 def_outthruputclass 11 # # IP Parameters # ipaddress 192.168.8.1 255.255.255.0 idletimer 600 holdtimer 300 mtu 1024 Configuration file after migration to X.25 over PSI Following is the generic configuration file for an X.25 interface over PSI (created using SAM): #cat /etc/x25/x25config # #X.
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# LCI TYPE HOW MANY lci 1 svc 255 # #Flow Control, Throughput Class, Fast Select and Reverse Charge Settings # flowcontrol off thruputclass off fast_select_accept disabled reverse_charge disabled def_inpacketsize 128 def_outpacketsize 128 def_inwindow 2 def_outwindow 2 def_inthruputclass 11 def_outthruputclass 11 # # IP Parameters # ipaddress 192.168.8.1 255.255.255.0 idletimer 600 holdtimer 300 mtu 1024 Note: The device used by X.
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For more information on configuring X.25/PSI, see HP X.25/9000 User’s Guide available at: http://docs.hp.com/en/netcom.html#X.25 HA Migration X.25/ACC HA Summary The MC ServiceGuard product (B3936AA) uses a user defined X.25/ACC monitor script to monitor the service in the control package.
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In the above X.25/ACC HA setup, the two ACC adapters on different systems (System A and system B) connect to a dual interface panel. Once the system A (Primary node) fails, Serviceguard package reconfigures System B (stand by node) into a running state. For more details, refer to the section ACC Service Guard Configuration Notes of X.25/ACC Installation and Configuration Guide available at: http://docs.hp.com/en/netcom.html#Advanced%20Communications%20Controller Note: X.
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Figure 7. X.25 / PSI Remote Failover setup X.25 PSI Adapter HP-UX System A Serial Line A X.25 Switch (Hunt Group Facility supported) X.25 Network X.25 Network Serial Line B HP-UX System B To Remote X.25 System X.25 PSI Adapter Legends Primary X.25 HA Cluster Standby In the above X.25/PSI HA setup, the Serial Line A and Serial Line B is configured in the same Hunt group. Once the PSI adapter on the system A (primary node) fails, the Serviceguard package migrates the X.
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• X.25/ACC needs a script running on each system in the Service guard cluster which controls the cluster configuration and helps in the Remote HA feature. In case of X.25/PSI, x25ifstate command is used to monitor the X.25 link and serves as a monitor script for the ServiceGuard package to achieve Remote HA feature.
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# ADD customer defined run commands. : # do nothing instruction, because a function must contain some command. print " ACC:Converting LBACK to RS232" /opt/acc/cfg/setRS232.zterm print " ACC:Starting X.25 Links" x25util 0 start test_return 51 } # You should define all actions you want to happen here, before the #service is halted function customer_defined_halt_cmds { # ADD customer defined halt commands. : # do nothing instruction, because a function must contain some command.
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function customer_defined_halt_cmds { # ADD customer defined halt commands. : # do nothing instruction, because a function must contain some command. #stopping the specific X.25 card means the signal modem will be down x25stop -d /dev/x25_1 test_return 52 } Conclusion The migration from X.25 over ACC adapter/ hardware to X.25 over PSI adapter offers the following benefits: • • • • Increased level of troubleshooting by providing the support for strace and complete Nettl tracing including level 2 tracing.